TTL to Line out / Line out to TTL schematic

I have an IC the produces a signal / code at TTL levels that I would like to convert to a Line out signal so that I can record the codes on my computer. Then I'd like to play these codes, take them from the line out from my computer or CD player and convert the level back to TTL Logic.

Anyone out there with any ideas or schematics who can direct me would be muchly appreciated.

Thanking you in advance

Regards Victor Nowecki

Please email me direct e-mail at snipped-for-privacy@box.net.au

Reply to
Victor Nowecki
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All you need to do for the conversion of TTL to line level signal is to drop the signal level somewhat and put a suitable capacitor in series.

For example youi can try 4.7 kohm resistor from TTL output to a common point. Then 1 kohm from this common point circuit ground. Then a suitable capacitor, for example 10 uF or larger from the common point to line output (if you use electrolytic capacitor put it such way that + points to that common point).

This converts the TTL output signal to the signal quite comparable to level typical to audio signal.

Rwemeber that this method does not pass the static logic state information, juts the signal state changes information.

Other idea if the logic state is necessary is to use the TTL outptu control to turn some auitable audio frequency oscillator on/off (for example logic 1 = audio output on).

Here are fre idea.

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Tomi Engdahl (http://www.iki.fi/then/)
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Reply to
Tomi Holger Engdahl

If you want a more or less reliable way to retreive digital data from an audio device you will need to convert the digital data into some form of sound and back.

Take a look at Kansas City tapes on

formatting link
and you will get the idea.

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Kind regards,
Gerard Bok
Reply to
Gerard Bok

like to

computer.

That won't work unless the TTL Signal is encoded correctly.

You need to tell us more about the frequency of the data and how it's encoded. If you have a low enough bit rate you might get away with a simple Voltage Controlled Oscillator (VCO) and a Frequency to Voltage Converter.

Reply to
CWatters

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